National Instruments 1128 用户手册

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Figure 2-10.  Mixed Mode Scanning with an SCXI-1331

You can scan the channels in any sequence you want. You can connect more 
than one SCXI-1127/1128 module together using the HVAB-backplane 
adapter from the SCXI-1357/1358 kits to expand the channel count of the 
system.

When combining different modes in one module it is important to use the 
channels efficiently. Generally you should connect the 4-wire channels 
first, followed by the 2-wire channels, and finally by the 1-wire channels.

The SCXI-1127/1128 provides a very flexible scanning architecture. You 
can scan the channels randomly and can have multiple input modes in the 
same scan. This is useful for connecting multiple sensor types to one 
module.

There are two basic methods of scanning—hardware-timed scanning 
and software scanning. In hardware-timed scanning, the measurement 
instrument, such as a DMM, communicates via digital trigger signals to the 

SCXI-1127

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